A vertical axis wind turbine with movable winged blades

Abstract

A vertical axis wind turbine with movable wings comprises a generator, a central main shaft, a tower, a transmission frame, movable wings, wherein the movable wings are uniformly arranged along the circumference of the central main shaft, and each movable wing comprises a movable wing, a structure frame, a limiting device, a bearing, a shaft, and a counterweight, one side of the movable wing is provided with a reinforcing frame, the counterweight is arranged in the reinforcing frame, a hole is formed in a predetermined position of the reinforcing frame, the bearing and the shaft are connected with the structure frame along the axis of the hole, and the limiting device limits the rotation range of the movable wing in the structure frame; the outer side of the transmission frame is connected with the movable wings, the inner side of the transmission frame is connected with the central main shaft; the central main shaft is connected with the generator; the tower supports the central main shaft and is coaxial with the central main shaft; and the generator is fixed to the tower.

Description

Technical Field

[0001] This invention relates to the field of wind power engine technology, and in particular to a vertical axis wind power engine with movable airfoil blades. Background Technology

[0002] Wind power, as a clean and renewable energy source, has experienced rapid development.

[0003] In vertical axis wind turbines, drag-type vertical axis wind turbines (such as cup turbines) reduce the total torque of the rotating shaft by the reverse torque generated by the blades in the upwind half of the turbine during operation. In contrast, vertical axis wind turbines with movable blades have a movable blade that is rotatably connected to the frame at the top and can be opened, as shown in 200820139674.X and 201110257812.0. When the turbine blades are in the downwind half of the turbine, the movable blade descends to close the air duct and perform work. When the turbine blades are in the upwind half of the turbine, the flat movable blade opens, and the wind passes directly through the middle of the frame, reducing the turbine drag. This minimizes the reverse torque of the blades in the upwind half of the turbine, resulting in greater kinetic energy and higher wind energy conversion efficiency.

[0004] The inventors discovered that the problems with this type of movable wing blade are that when the top of the movable wing is rotatably connected to the frame and the thickness of the movable wing blade is large, the weight of the movable wing tends to increase, making it difficult to open at low wind speeds. When the weight of the movable wing blade is small, it is prone to deformation or insufficient durability, and the blade has low wind capture efficiency in the downwind half-zone. Therefore, further improvements to the technology of vertical axis wind turbines are needed to enable them to capture wind energy more effectively, which has become an urgent engineering problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies, such as the increased weight of movable blades in vertical axis wind turbines when the thickness is large, difficulty in opening the movable blades at low wind speeds, easy deformation when the thickness is small, and low wind capture efficiency in the downwind working zone. The invention provides a vertical axis wind turbine with movable blades that have high structural strength, are not easily deformed, and have higher wind capture efficiency in the downwind working zone.

[0006] The objective of this invention is achieved through the following technical solution: A vertical axis wind turbine with movable airfoil blades includes: a generator, a central main shaft, a tower, a transmission frame, and movable airfoil blades, wherein... The movable airfoil blades are evenly arranged circumferentially along the central main axis, including: movable airfoil, structural frame, limiting device, bearing, shaft, and counterweight. A reinforcing frame is provided on one side of the movable airfoil blade, and the counterweight is installed in the reinforcing frame. An opening is opened at a preset position on the reinforcing frame. The bearing and shaft are used to connect the opening to the structural frame along the extended axis of the opening. The limiting device limits the rotation range of the movable airfoil within the opening of the structural frame. The outer side of the transmission frame is connected to the movable airfoil blade, and the inner side of the transmission frame is connected to the central main shaft. The central spindle is connected to the generator; The tower supports the central main shaft and they are coaxial with each other; The generator is fixed to the tower.

[0007] The advantages and beneficial effects of this invention are: 1. The movable wing has a higher wind-catching efficiency, which is beneficial to the wind power engine's higher wind energy conversion efficiency; 2. The movable wings have higher strength, longer durability, and are less prone to deformation; 3. Reduce carbon emissions and provide green energy; 4. High recycling rate and low pollution rate. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0009] Figure 1 This is a three-dimensional schematic diagram of the vertical axis wind turbine of the present invention.

[0010] Figure 2 This is a three-dimensional schematic diagram of the single-port movable airfoil blade of the vertical axis wind turbine of the present invention.

[0011] Figure 3 This is a three-dimensional schematic diagram of the structural frame of the single-port movable airfoil blade of the vertical axis wind turbine of the present invention.

[0012] Figure 4 This is a three-dimensional schematic diagram of the movable blade of the single-port movable airfoil blade of the vertical axis wind turbine of the present invention.

[0013] Figure 5 This is a three-dimensional schematic diagram of the vertical axis wind turbine of the present invention. Figure 2 . Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be preferably 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.

[0015] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0016] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if "and / or" or "and / or" appears throughout the text, it includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies solutions A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention. Example

[0017] like Figure 1 , 2 As shown in Figures 3 and 4, a vertical axis wind turbine with movable airfoil blades includes: a generator (1), a central main shaft (2), a tower (3), a transmission frame (4), and movable airfoil blades (5), wherein, The movable airfoil blade (5) is evenly arranged along the circumference of the central main shaft (2), including: movable airfoil (11), structural frame (12), limiting device (13), bearing (14), shaft (15), and counterweight (16). A reinforcing frame (17) is provided on one side of the airfoil (11), and the counterweight (16) is installed in the reinforcing frame (17). An opening (18) is opened at a preset position on the reinforcing frame (17). The bearing (14) and shaft (15) are used to connect the opening (18) to the structural frame (12) on the axial extension line. The limiting device (13) limits the rotation range of the movable airfoil (11) within the frame opening of the structural frame (12). The outer side of the transmission frame (4) is connected to the movable airfoil blade (5), and the inner side of the transmission frame (4) is connected to the central main shaft (2). The central spindle (2) is connected to the generator (1); The tower (3) supports the central main shaft (2) and they are coaxial with each other; The generator (1) is fixed to the tower (3).

[0018] In an optional implementation, the central spindle (2) is connected to the generator (1) via a transmission mechanism or a direct drive connection.

[0019] In an optional embodiment, the generator (1) is fixed to the top of the tower (3).

[0020] In an optional embodiment, the bearing (14) is fixed horizontally on the frame of the structural frame (12) or on the reinforcing frame (17) of the movable wing (11), and the central hole of the bearing (14) is connected to the reinforcing frame (17) of the movable wing (11) or the frame of the structural frame (12) using the shaft (15).

[0021] In an optional implementation, the number of the movable airfoil blades (5) is three or more.

[0022] The reinforcing frame (17) is a metal plate, including an edge reinforcing frame (19) and an inner reinforcing frame (20). The edge reinforcing frame (19) is a metal plate on one side of the wing plate of the movable wing (11) when it is a metal plate. The inner reinforcing frame (20) is a metal plate strip welded to the inner side of the edge reinforcing frame (19) on the wing plate.

[0023] In an optional embodiment, the counterweight (16) is installed inside the edge reinforcement frame (19) at the top of the movable wing (11).

[0024] In an optional implementation, the preset position is the upper half of the height of the longitudinal borders on both sides of the reinforcing frame (17).

[0025] In an optional implementation, the length ratio of the upper half of the preset position to the lower half of the preset position of the movable wing (11) is less than 4:6.

[0026] In an optional embodiment, the transmission frame (4) is a steel pipe or a truss structure assembled by welding steel pipes.

[0027] The frame (12) has several frames in the longitudinal and / or transverse directions, and the lower part of the frame (12) is provided with steel wheels and steel rails supporting the steel wheels. Example

[0028] like Figure 1 , 2 As shown in Figures 3, 4, and 5, a vertical axis wind turbine with movable airfoil blades includes: a generator (1), a central main shaft (2), a tower (3), a transmission frame (4), and movable airfoil blades (5), wherein... The movable airfoil blade (5) is evenly arranged along the circumference of the central main shaft (2), including: movable airfoil (11), structural frame (12), limiting device (13), bearing (14), shaft (15), and counterweight (16). A reinforcing frame (17) is provided on one side of the airfoil (11), and the counterweight (16) is installed in the reinforcing frame (17). An opening (18) is opened at a preset position on the reinforcing frame (17). The bearing (14) and shaft (15) are used to connect the opening (18) to the structural frame (12) on the axial extension line. The limiting device (13) limits the rotation range of the movable airfoil (11) within the frame opening of the structural frame (12). The outer side of the transmission frame (4) is connected to the movable airfoil blade (5), and the inner side of the transmission frame (4) is connected to the central main shaft (2). The central spindle (2) is connected to the generator (1); The tower (3) supports the central main shaft (2) and they are coaxial with each other; The generator (1) is fixed to the tower (3).

[0029] In an optional implementation, the central spindle (2) is connected to the generator (1) via a transmission mechanism or a direct drive connection.

[0030] In an alternative implementation, the generator (1) may be fixed inside the tower (3).

[0031] In an optional embodiment, the transmission mechanism includes a slewing support bearing (21) and a hub (22). The hub is located on the upper part of the tower (3) and the slewing support bearing is disposed in the middle therein. The slewing support bearing or the hub drives the generator (1) through its internal teeth.

[0032] In an optional embodiment, the bearing (14) is fixed horizontally on the frame of the structural frame (12) or on the reinforcing frame (17) of the movable wing (11), and the central hole of the bearing (14) is connected to the reinforcing frame (17) of the movable wing (11) or the frame of the structural frame (12) using the shaft (15).

[0033] In an optional implementation, the number of the movable airfoil blades (5) is three or more.

[0034] The reinforcing frame (17) is a metal plate, including an edge reinforcing frame (19) and an inner reinforcing frame (20). The edge reinforcing frame (19) is a metal plate on one side of the wing plate of the movable wing (11) when it is a metal plate. The inner reinforcing frame (20) is a metal plate strip welded to the inner side of the edge reinforcing frame (19) on the wing plate.

[0035] In an optional embodiment, the counterweight (16) is installed inside the edge reinforcement frame (19) at the top of the movable wing (11).

[0036] In an optional implementation, the preset position is the upper half of the height of the longitudinal borders on both sides of the reinforcing frame (17).

[0037] In an optional implementation, the length ratio of the upper half of the preset position to the lower half of the preset position of the movable wing (11) is less than 4:6.

[0038] In an optional embodiment, the transmission frame (4) is a steel pipe or a truss structure assembled by welding steel pipes.

[0039] In an optional embodiment, the transmission frame (4) includes a truss structure arm (23), a tie rod (24), and a swivel tie rod (25). The structure frame (12) is connected to the transmission frame (4) by a flange connection, welding, or pin connection.

[0040] The frame (12) has several frames in the longitudinal and / or transverse directions, and the lower part of the frame (12) is provided with steel wheels and steel rails supporting the steel wheels.

[0041] (1) Due to the asymmetry of the wind turbine blades and the unevenness of air resistance, the wind exerts a driving torque around the axis of rotation on the blades, which causes the wind turbine to start rotating.

[0042] F = 1 / 2 × ρ × S × V 2 × C Where ρ is the air density, typically taken as 1.25 kg / m³. S — Windward area of ​​the wind turbine V — Incoming wind speed C — Aerodynamic coefficient For a hemispherical wind turbine: the value of C is 1.33 when the windward half is concave and the windward half is convex. The value of C is 0.34. For cylindrical wind turbines: the C coefficient is 2.3 when the turbine is concave in the downwind half-region; and 1.2 when the turbine is convex in the upwind half-region. The number of reinforcing frames (17) installed on the movable wing blade (5) increases the aerodynamic coefficient of the blade in the downwind half-zone; the wind energy required for the movable wing (11) to open is reduced by installing counterweights (16), thereby reducing the aerodynamic coefficient of the blade in the upwind half-zone and improving the wind energy conversion efficiency.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. A vertical axis wind turbine with movable airfoil blades, characterized in that, include: Generator, central spindle, tower, transmission frame, movable airfoil blades, among which, The movable airfoil blades are evenly arranged circumferentially along the central main axis, including: movable airfoil, structural frame, limiting device, bearing, shaft, and counterweight. A reinforcing frame is provided on one side of the movable airfoil blade, and the counterweight is installed in the reinforcing frame. An opening is opened at a preset position on the reinforcing frame. The bearing and shaft are used to connect the opening to the structural frame along the extended axis of the opening. The limiting device limits the rotation range of the movable airfoil within the opening of the structural frame. The outer side of the transmission frame is connected to the movable airfoil blade, and the inner side of the transmission frame is connected to the central main shaft. The central spindle is connected to the generator; The tower supports the central main shaft and they are coaxial with each other; The generator is fixed to the tower.

2. A vertical axis wind turbine with movable airfoil blades according to claim 1, characterized in that: The central spindle is connected to the generator via a transmission mechanism or a direct drive connection.

3. A vertical axis wind turbine with movable airfoil blades according to claim 1, characterized in that: The generator is fixed to the top of the tower or inside the tower.

4. A vertical axis wind turbine with movable airfoil blades according to claims 1 and 2, characterized in that: The transmission mechanism includes a slewing bearing and a hub. The hub is located on the upper part of the tower and the slewing bearing is disposed in the middle therein. The slewing bearing or the hub drives the generator through its internal teeth.

5. A vertical axis wind turbine with movable airfoil blades according to claim 1, characterized in that: The bearing's shaft is fixed horizontally to the frame of the structural frame or the reinforcing frame of the movable wing, and the bearing's central hole is connected to the reinforcing frame of the movable wing or the frame of the structural frame using the shaft.

6. A vertical axis wind turbine with movable airfoil blades according to claim 1, characterized in that: The number of movable airfoil blades is more than three.

7. A vertical axis wind turbine with movable airfoil blades according to claim 1, characterized in that: The counterweight is installed inside the reinforcing frame at the top of the movable wing.

8. A vertical axis wind turbine with movable airfoil blades according to claim 1, characterized in that: The preset position is the upper half of the height of the vertical borders on both sides of the reinforced frame.

9. A vertical axis wind turbine with movable airfoil blades according to claim 1, characterized in that: The transmission frame is a steel pipe, or a truss structure assembled by welding steel pipes.

10. A vertical axis wind turbine with movable airfoil blades according to claims 1 and 9, characterized in that: The transmission frame includes truss structure arms, diagonal tie rods, and swivel tie rods.

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