Vertical axis wind turbine

Abstract

The invention discloses a vertical axis wind driven generator, which relates to the field of wind driven generators, and comprises a stand column, the stand column is coaxially and rotatably connected with a rotating shaft, the bottom end of the rotating shaft is connected with a power generation assembly, the rotating shaft is connected with two mounting plates at intervals along the height direction, and a plurality of blades are connected between the mounting plates; the baffle is rotationally connected between the stand column and the mounting plate at the top end of the rotating shaft through a support assembly and used for shielding the windward side of the blade, and the tail end of the support assembly of the baffle is connected with an empennage. The baffle structure capable of automatically adjusting the angle according to the wind direction shields the windward sides of the blades, the situation that environment airflow exerts reverse torque on the blades is effectively avoided, and after the leeward sides of the blades are shielded, due to the fact that the windward sides on the two sides of the blade shafts are different in torque, the blades rotate around the rotating shaft and are adjusted to the angle with small wind resistance through rotation of the blade shafts; therefore, the wind resistance during rotation behind the baffle is reduced, and the power generation efficiency of the vertical-axis wind turbine is effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of wind turbines, in particular to a vertical axis wind turbine. Background Art

[0002] The rotating axis of the wind rotor of a vertical axis wind turbine is perpendicular to the ground or the direction of the airflow. There is no need for yaw adjustment when the wind direction changes. This is a major advantage over horizontal axis wind turbines. It not only simplifies the structural design, but also reduces the gyroscopic force of the wind rotor against the wind.

[0003] In the prior art, the blades of a vertical axis wind turbine are generally fixedly connected to the rotating shaft of the turbine. The cross section of the blade is arc-shaped, and the power is obtained by the difference between the resistance of the windward side and the resistance of the leeward side of the blade.

[0004] The Chinese patent with the relevant announcement number CN114810474B discloses a vertical axis wind turbine, including a bracket, the bracket including a base, a main shaft mounted on the base and a secondary shaft arranged parallel to the main shaft; blades, the blades are vertically arranged and mounted on the main shaft and the secondary shaft through a connecting rod mechanism; and a connecting rod mechanism, the connecting rod mechanism includes a large push rod and a small push rod, the proximal end of the large push rod is mounted on the main shaft through a rotating pair, and the distal end is connected to the distal end of the blade through a rotating pair; the proximal end of the small push rod is mounted on the secondary shaft through a rotating pair, and the distal end is connected to the proximal end of the blade through a rotating pair; the main shaft, The secondary shaft, blades and connecting rod mechanism together form a double crank mechanism. The proximal end of the large push rod is connected to the generator through a transmission mechanism. The double crank mechanism changes the posture of the blade during its rotation around the main shaft, so that the windward resistance of the blade changes, so as to continuously rotate and generate electricity. There are multiple blades, and the multiple blades are respectively installed around the main shaft through corresponding connecting rod mechanisms. The main shaft is provided with a push rod seat that can rotate freely. The proximal end of each large push rod is fixed on the push rod seat, and the push rod seat is connected to the generator through a transmission mechanism. The secondary shaft is connected to the main shaft through a fixing rod, and the fixing rod is perpendicular to the wind direction.

[0005] In response to the above-mentioned related technologies, in order to improve the utilization rate of wind energy, the existing vertical axis wind turbines use a connecting rod structure to adjust the angle of the blades. However, the adjusted blades still have a certain windward area, and a reverse torque will still be applied to the rotating shaft during the rotation of the rotating shaft. The more complex connecting rod structure leads to an increase in the manufacturing cost of the generator, and under the influence of strong winds in severe weather, the high-frequency pitch change of the connecting rod structure can easily cause damage to the rotating connecting shaft. In summary, the working efficiency of the existing vertical axis wind turbines needs to be improved. Summary of the Invention

[0006] Based on this, an object of the present invention is to provide a vertical axis wind turbine to solve the technical problem that the working efficiency of the existing vertical axis wind turbine needs to be improved.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a vertical axis wind turbine, comprising a column, which is coaxially connected to a rotating shaft, and a power generation component is connected to the bottom end of the rotating shaft, the rotating shaft is connected to two mounting plates spaced apart in the height direction, and multiple blades are connected between the mounting plates, and also includes a baffle, which is rotatably connected between the column and the mounting plate at the top end of the rotating shaft through a bracket assembly, the baffle is used to block the windward surface of the blade, and the tail end of the bracket assembly of the baffle is connected to a tail wing.

[0008] By adopting the above technical solution, the baffle structure that can automatically adjust the angle according to the wind direction blocks the windward side of the blade, effectively preventing the ambient airflow from applying a reverse torque to the blade, and at the same time allowing the blade to rotate and connect between the mounting plates. After the leeward side of the blade is blocked, due to the different torques on the windward sides on both sides of the blade shaft, the blade revolves around the rotating axis while adjusting to an angle with low wind resistance by rotating the blade shaft, thereby reducing the wind resistance when rotating behind the baffle, and effectively improving the power generation efficiency of the vertical axis wind turbine.

[0009] The present invention is further configured such that the blade is rotatably connected between the mounting plates, the blade shaft rotatably connected to the mounting plate is located at one end of the blade close to the rotating shaft, the top and bottom of the blade are fixedly connected with fixed blocks, and the fixed blocks are fixedly connected to the limiting axis along the vertical direction toward the mounting plate, and when the leeward side of the blade is exposed to wind, the limiting axis is in close contact with the mounting plate.

[0010] Preferably, when the blades rotate to the area blocked by the baffle, the angles can be adjusted by rotating the blade axes themselves to reduce wind resistance.

[0011] The present invention is further configured such that the mounting plate is rotatably connected to a limiting plate corresponding to each blade on a side away from the blade, and the limiting plate is provided with a sliding groove for sliding of the limiting shaft, and the limiting shaft passes through the limiting plate and can slide in the sliding groove. When the limiting shaft slides to the maximum stroke in the sliding groove, the blade corresponding to the limiting shaft is in a low wind resistance state revolving around the rotating shaft.

[0012] As a preferred embodiment, the resistance of the blades to the rotating shaft when they move behind the baffle is reduced, thereby improving the power generation efficiency of the wind turbine.

[0013] The present invention is further configured such that the top end of the baffle is rotatably connected to the mounting plate via a connecting frame, and the bottom end is rotatably connected to the column via another connecting frame, the connecting frame at the top end is fixedly connected to a connecting ear, the connecting ear is connected to a connecting rod, and the end of the connecting rod away from the connecting ear is fixedly connected to a tail wing.

[0014] Preferably, the tail wing can enable the baffle to automatically adjust its direction according to changes in wind direction.

[0015] The present invention is further configured such that a telescopic column is rotatably connected between the connecting frame and the connecting rod, the telescopic column is used to control the angle between the connecting frame and the connecting rod, and an anemometer is also installed on the top of the connecting frame.

[0016] Preferably, when the wind speed measured by the anemometer is too high, the angle between the connecting rod and the connecting frame is controlled by the telescopic column to increase the wind-receiving area of ​​the baffle to prevent the rotating shaft from being damaged due to excessive rotation speed.

[0017] The present invention is further configured such that the distance between the inner wall of the baffle and the rotating shaft is greater than the rotation radius of the blade.

[0018] Preferably, the blades are prevented from hitting the baffle during rotation.

[0019] The present invention is further configured such that the cross-section of the baffle is curved, the distance between the front section of the inner wall of the baffle and the rotating shaft is greater than the rotation radius of the blade when it is not rotating, and the distance between the rear section of the inner wall of the baffle and the rotating shaft is smaller than the rotation radius of the blade when it is not rotating, and the baffle will not interfere with the rotation of the blade.

[0020] Preferably, while preventing the blades from hitting the baffle, the wind-exposed area of ​​the baffle is reduced as much as possible, so as to achieve the purpose of improving the stability of the column.

[0021] The present invention is further configured such that an extension line of the leeward end of the blade where the limiting shaft contacts the mounting plate is tangent to the windward end of the blade where the limiting shaft slides in the slide groove to a maximum stroke.

[0022] Preferably, the curved blades can guide the airflow to the blades behind the baffle when the leeward side is exposed to wind, which is beneficial for the blades behind the baffle to quickly reset before leaving the shielding range of the baffle.

[0023] In summary, the present invention mainly has the following beneficial effects: The present invention blocks the windward side of the blades through a baffle structure that can automatically adjust the angle according to the wind direction, effectively preventing the ambient airflow from applying a reverse torque to the blades, and at the same time allowing the blades to rotate and be connected between the mounting plates. After the leeward side of the blades is blocked, due to the different torques on the windward sides on both sides of the blade shaft, the blades revolve around the rotating axis while adjusting to an angle with low wind resistance by rotating the blade shaft, thereby reducing the wind resistance when rotating behind the baffle, and effectively improving the power generation efficiency of the vertical axis wind turbine.

[0024] The present invention has an adjustable tail wing structure rotatably connected to the top of the baffle frame. In bad weather, the tail wing can be rotated and adjusted to increase the wind receiving area of ​​the baffle, reduce the work done by the airflow on the blades, and thus reduce the rotation speed of the blades to achieve the purpose of protecting the blades and the rotating shaft. The present invention fixes a fixing block to one end of the blade close to the rotating shaft, and uses a limiting shaft connected to the fixing block to limit the rotation angle of the blade. When the leeward side of the blade is affected by the airflow, the limiting shaft closely contacts the mounting plate to limit the rotation of the blade. The force applied to the blade at this time is converted into a positive torque during the rotation of the rotating shaft, providing a rotational force for the rotating shaft, thereby stably utilizing the ambient airflow to accelerate the rotation of the rotating shaft, and the rotating shaft can be started even in a low-speed wind environment. The present invention limits the rotation angle of the blade by rotating the connecting limit plate on the mounting plate and utilizing the groove in the limit plate to cooperate with the limit shaft. When the blade adjusts the angle by rotating about its own rotation axis, it prevents the blade from being unable to reset due to excessive rotation angle adjustment when it is about to leave the shielding range of the baffle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional diagram of a blade of the present invention about to leave the baffle; Figure 2 For the present invention Figure 1 A magnified view of middle A; Figure 3 This is a three-dimensional view of the present invention from another perspective, showing a blade about to leave the baffle; Figure 4 For the present invention Figure 3 Enlarged view of middle B; Figure 5 A front view of a blade of the present invention about to leave the baffle; Figure 6 For the present invention Figure 5 Enlarged view of middle C; Figure 7 A three-dimensional diagram of a blade of the present invention leaving the baffle; Figure 8 This is a three-dimensional diagram of the present invention in a state where the baffle is removed; Figure 9 A top view of a blade of the present invention about to leave the baffle; Figure 10 A top view of one of the blades of the present invention leaving the baffle; Figure 11 It is a top view of the present invention with the baffle removed.

[0026] Description of reference numerals: 1. Column; 2. Rotating shaft; 3. Mounting plate; 4. Blade; 5. Baffle; 6. Connecting frame; 7. Connecting ear; 8. Connecting rod; 801, tail wing; 9. Telescopic column; 10. Anemometer; 11. Fixed block; 12. Limiting shaft; 13. Limiting plate; 1301, slide groove. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0028] The following describes an embodiment of the present invention based on its overall structure. Example 1

[0029] A vertical axis wind turbine, see Figure 1-11 , including a column 1, a mounting foot is provided at the bottom end of the column 1, and the column 1 can be fixedly installed at the required installation position by bolts and other connecting parts. The column 1 is coaxially connected to the rotating shaft 2, and a power generation component is connected to the bottom end of the rotating shaft 2. Specifically, the bottom end of the rotating shaft 2 is connected to the acceleration gearbox through a coupling, and the output shaft of the acceleration gearbox is connected to the generator. The generator converts the mechanical energy of the rotating shaft 2 into electrical energy. The specific conversion method and principle are fully recorded in the prior art. This application does not improve the power generation principle and will not go into details here. The rotating shaft 2 is connected with two mounting plates 3 at intervals along the height direction, and multiple blades 4 are connected between the mounting plates 3. Specifically, in this embodiment, the number of blades 4 is three, and they are all arranged at 120° intervals on the annular surface.

[0030] It also includes a baffle 5 with an arc-shaped structure. The height of the baffle 5 is greater than the height of the blade 4. The baffle 5 is rotatably connected between the column 1 and the mounting plate 3 at the top of the rotating shaft 2 through a bracket assembly. The baffle 5 is used to block the windward side of the blade 4 to prevent the airflow in the external environment from blowing onto the wind-inducing surface of the blade 4 and applying a reverse torque to the rotating shaft 2. The tail end of the bracket assembly of the baffle 5 is connected to a tail wing 801, so that the baffle 5 is always facing the direction of the incoming wind.

[0031] In the above embodiment, please refer to Figure 1-4 、 Figure 11 The top end of the baffle 5 is rotatably connected to the mounting plate 3 through a connecting frame 6, and the bottom end is rotatably connected to the column 1 through another connecting frame 6. Specifically, the connecting frame 6 will not interfere with the rotation of the blade 4. The top connecting frame 6 is fixedly connected to a connecting ear 7, and the connecting ear 7 is connected to a connecting rod 8. The end of the connecting rod 8 away from the connecting ear 7 is fixedly connected to a tail wing 801. The tail wing 801 can enable the baffle 5 to automatically adjust its direction according to changes in wind direction.

[0032] Specifically, in the same horizontal plane, the front end point of the baffle 5, the connection point of the connecting ear 7 and the connecting rod 8, and the front end point of the tail wing 801 are in a straight line. When the wind direction in the external environment changes, the baffle 5 can quickly adjust its direction to the direction of the incoming wind through the tail wing 801 to block the windward side of the blade 4. In the above embodiment, please refer to Figure 1 and Figure 11 The distance between the inner wall of the baffle 5 and the rotating shaft 2 is greater than the rotation radius of the blade 4 to prevent the blade 4 from hitting the baffle 5 during rotation. When the blade 4 is not rotating, the maximum rotation radius of the blade 4 is the straight-line distance from the end of the blade to the rotating shaft 2, and the distance between the inner wall of the baffle 5 and the rotating shaft 2 is greater than the distance from the end of the blade 4 to the rotating shaft 2. Example 2

[0033] A vertical axis wind turbine, see Figure 1-11 On the basis of the first embodiment, the difference from the first embodiment is that the blade 4 is rotatably connected between the mounting plates 3, and the blade shaft rotatably connected to the blade 4 and the mounting plate 3 is located at the end of the blade 4 close to the rotating shaft 2. Under the premise of no external wind, when the rotating shaft 2 rotates, the blade 4 is bounded by its own blade shaft, and the wind resistance at the end away from the rotating shaft 2 will be greater than the wind resistance at the end close to the rotating shaft 2. Therefore, when the blade 4 can rotate with the blade shaft, the blade 4 will automatically adjust the angle to the position behind the baffle 5 to move around the rotating shaft 2 with small wind resistance. Specifically, the small wind resistance state of the blade 4 at this time is compared with the state before the blade 4 rotates. The wind resistance of the blade 4 after self-rotation during the process of revolution around the rotating shaft 2 is smaller than that of the blade 4 that does not rotate.

[0034] Furthermore, the top and bottom of the blade 4 are fixedly connected with a fixing block 11, and the fixing block 11 is fixedly connected with a limiting shaft 12 along the vertical direction toward the mounting plate 3. Specifically, the axis of the limiting shaft 12 is coaxial with the rotating shaft 2. When the leeward side of the blade 4 is exposed to wind, the limiting shaft 12 is in close contact with the mounting plate 3. When the blade 4 rotates to the area blocked by the baffle 5, the angle can be adjusted by rotating its own blade axis to reduce wind resistance, thereby improving the efficiency of wind energy utilization.

[0035] In the above embodiment, please refer to Figure 1-4 、 Figure 9-10 , the mounting plate 3 is rotatably connected to the limiting plate 13 corresponding to each blade 4 on the side away from the blade 4, and a slide groove 1301 is provided on the limiting plate 13 for the sliding of the limiting shaft 12. The limiting shaft 12 passes through the limiting plate 13 and can slide in the slide groove 1301. When the limiting shaft 12 slides to the maximum stroke in the slide groove 1301, the blade 4 corresponding to the limiting shaft 12 is in a small wind resistance state revolving around the rotating shaft 2. At this time, the limiting shaft 12, the rotating shaft of the limiting plate 13, and the blade axis of the blade 4 form a stable triangular structure, which can effectively reduce the vibration generated by the blade 4 during the revolution, reduce the resistance of the blade 4 to the rotating shaft 2 when the blade 4 moves behind the baffle 5, and thereby improve the power generation efficiency of the wind turbine.

[0036] Specifically, the cross-section of the baffle 5 is curved, and the distance between the front section of the inner wall of the baffle 5 and the rotating shaft 2 is greater than the rotation radius of the blade 4 in the non-rotating state, and the distance between the rear section of the inner wall of the baffle 5 and the rotating shaft 2 is smaller than the rotation radius of the blade 4 in the non-rotating state. After the air pressure on the leeward side of the blade 4 is lower than the air pressure on the windward side, the blade 4 will be affected by the airflow on the windward side and rotate around its own blade axis. At this time, the straight-line distance between the end of the blade 4 and the rotating shaft 2 will be shortened, and the blade 4 will gradually rotate and reset before leaving the shielding range of the baffle 5, and the end of the blade 4 will gradually restore the initial distance from the rotating shaft 2. Therefore, the rear section of the baffle 5 can be closer to the rotating shaft 2 than the front section to reduce the wind-exposed area of ​​the baffle 5, and the baffle 5 will not interfere with the rotation of the blade 4. While avoiding the blade 4 hitting the baffle 5, the wind-exposed area of ​​the baffle 5 is reduced as much as possible to achieve the purpose of improving the stability of the column 1.

[0037] In the above embodiment, please refer to Figure 10-11 The extension line of the leeward end of the blade 4 where the limiting shaft 12 contacts the mounting plate 3 is tangent to the windward end of the blade 4 where the limiting shaft 12 slides to the maximum stroke in the slide groove 1301. When the curved blade 4 is exposed to wind on the leeward side, it can guide the airflow to the blade 4 behind the baffle 5, which is beneficial for the blade 4 behind the baffle 5 to quickly reset before it is about to leave the shielding range of the baffle 5.

[0038] Specifically, before the blade 4 is about to leave the shielding range of the baffle 5, the end of the blade 4 close to the rotating shaft 2 with its own blade axis as the boundary will first be impacted by the external airflow and a torque is applied with the blade axis as the axis to reset the blade 4. On this basis, the airflow guided by the leeward side of the adjacent blade 4 blows to the end of the blade 4 to be reset, and further applies a torque centered on the blade axis to the blade 4, thereby enabling the blade 4 to be quickly reset, making it easier for a torque centered on the rotating shaft 2 to be applied to the leeward side of the blade 4. Example 3

[0039] A vertical axis wind turbine, see Figure 1-11 A telescopic column 9 is rotatably connected between the connecting frame 6 and the connecting rod 8. Specifically, the telescopic column 9 can adopt telescopic control components commonly used in the prior art, such as electric telescopic rods and hydraulic rods. In this embodiment, the telescopic column 9 specifically adopts an electric telescopic rod. The telescopic column 9 is used to control the angle between the connecting frame 6 and the connecting rod 8. When the telescopic column 9 is extended, the angle between the connecting rod 8 and the connecting frame 6 increases. After the tail wing 801 is affected by the external airflow, the baffle 5 can block a part of the leeward side of the blade 4, thereby achieving the purpose of protecting the rotating shaft 2 when the external weather conditions are bad.

[0040] Furthermore, an anemometer 10 is installed at the top of the connecting frame 6. This application does not make any improvements to the anemometer 10, and its working principle will not be described in detail here. When the wind speed measured by the anemometer 10 is too high, the angle between the connecting rod 8 and the connecting frame 6 is controlled by the telescopic column 9 to increase the wind-receiving area of ​​the baffle 5 to prevent the rotating shaft 2 from being damaged due to excessive rotation speed.

[0041] When the vertical axis wind turbine is working: the tail 801 orders the baffle 5 to rotate to face the wind under the action of the ambient airflow, and the leeward side of the blade 4 not blocked by the baffle 5 revolves around the rotation axis 2 under the action of the airflow. When the blade 4 rotates to the state where the pressure on the leeward side is less than the pressure on the windward side, due to the eccentric setting of the blade axis of the blade 4 itself, the blade automatically adjusts to the low wind resistance state of revolving around the rotation axis 2 by rotating its own blade axis, and continues to revolve around the rotation axis 2 behind the baffle 5 without the influence of the external airflow. In this process, the resistance of the blade 4 that is not doing work is reduced as much as possible, thereby achieving In order to fully utilize the wind energy, before the blade 4 leaves the shielding range of the baffle 5, the end of the windward side of the blade 4 is affected by the airflow guided by the leeward side of the adjacent blade, and is also affected by the airflow in the external environment, so that the blade 4 rotates and resets with its own blade axis. Before the blade 4 completely leaves the shielding range of the baffle 5, the limiting shaft 12 corresponding to the blade 4 is in close contact with the mounting plate 3, and the shaft 2 is reciprocally forced. The generator located in the column 1 connected to the bottom end of the shaft 2 converts mechanical energy into electrical energy, thereby realizing efficient utilization of wind energy.

[0042] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A vertical axis wind turbine, characterized in that: include: A column (1), wherein the column (1) is coaxially rotatably connected to a rotating shaft (2), and a power generation component is connected to the bottom end of the rotating shaft (2); the rotating shaft (2) is connected to two mounting plates (3) at intervals along the height direction, and a plurality of blades (4) are connected between the mounting plates (3); A baffle (5) is rotatably connected between the column (1) and the mounting plate (3) at the top end of the rotating shaft (2) through a bracket assembly. The baffle (5) is used to shield the windward surface of the blade (4). The rear end of the bracket assembly of the baffle (5) is connected to a tail wing (801).

2. The vertical axis wind turbine according to claim 1, characterized in that: The blade (4) is rotatably connected between the mounting plates (3); the blade shaft rotatably connected to the blade (4) and the mounting plate (3) is located at one end of the blade (4) close to the rotating shaft (2); the top and bottom of the blade (4) are fixedly connected to a fixing block (11); the fixing block (11) is fixedly connected to a limiting axis (12) in a vertical direction toward the mounting plate (3); when the leeward side of the blade (4) is exposed to wind, the limiting axis (12) is in close contact with the mounting plate (3).

3. The vertical axis wind turbine according to claim 2, characterized in that: The mounting plate (3) is rotatably connected to a limiting plate (13) on a side away from the blades (4) corresponding to each blade (4); the limiting plate (13) is provided with a sliding groove (1301) for the limiting shaft (12) to slide; the limiting shaft (12) passes through the limiting plate (13) and can slide in the sliding groove (1301); when the limiting shaft (12) slides to a maximum stroke in the sliding groove (1301), the blade (4) corresponding to the limiting shaft (12) is in a small wind resistance state revolving around the rotating shaft (2).

4. The vertical axis wind turbine according to claim 1, characterized in that: The top end of the baffle (5) is rotatably connected to the mounting plate (3) via a connecting frame (6), and the bottom end is rotatably connected to the column (1) via another connecting frame (6), the connecting frame (6) at the top end is fixedly connected to a connecting ear (7), the connecting ear (7) is connected to a connecting rod (8), and the end of the connecting rod (8) away from the connecting ear (7) is fixedly connected to a tail wing (801).

5. The vertical axis wind turbine according to claim 4, characterized in that: A telescopic column (9) is rotatably connected between the connecting frame (6) and the connecting rod (8), and the telescopic column (9) is used to control the angle between the connecting frame (6) and the connecting rod (8). An anemometer (10) is also installed at the top end of the connecting frame (6).

6. The vertical axis wind turbine according to claim 1, characterized in that: The distance between the inner wall of the baffle (5) and the rotating shaft (2) is greater than the rotation radius of the blade (4).

7. The vertical axis wind turbine according to claim 3, characterized in that: The baffle (5) has a curved cross-section, the distance between the front section of the inner wall of the baffle (5) and the rotating shaft (2) is greater than the rotation radius of the blade (4) in a non-rotating state, and the distance between the rear section of the inner wall of the baffle (5) and the rotating shaft (2) is less than the rotation radius of the blade (4) in a non-rotating state, and the baffle (5) will not interfere with the rotation of the blade (4).

8. The vertical axis wind turbine according to claim 3, characterized in that: An extension line of the leeward end of the blade (4) where the limiting shaft (12) contacts the mounting plate (3) is tangent to the windward end of the blade (4) where the limiting shaft (12) slides in the slide groove (1301) to the maximum stroke.

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