Wind driven generator and energy storage system

Abstract

The embodiment of the invention relates to a wind driven generator and an energy storage system. The wind driven generator comprises a generator, a rotating shaft and a resistance wind wheel. The rotating shaft is an input end of the generator; the resistance wind wheel comprises two resistance blades, a base plate and an upper cover, the base plate and the upper cover are arranged at intervals, the resistance blades are fixed to the base plate and the upper cover respectively, and the base plate is fixed to the rotating shaft. The resistance wind wheel is configured to rotate in the first rotating direction. With the center of the base plate as the center, one resistance blade can coincide with the other resistance blade after rotating by 180 degrees in the second rotating direction, and the second rotating direction is opposite to the first rotating direction; the resistance blade is provided with a middle cross section, a top surface connected to the upper cover and a bottom surface connected to the chassis; in a second rotational direction, the top surface is twisted by a first predetermined angle relative to the middle cross section and the bottom surface is twisted by a second predetermined angle relative to the middle cross section. The top face and the bottom face are twisted in the same direction in the first rotating direction, the stress angle range is enlarged, and the risk of generating a starting dead zone can be reduced.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a wind turbine and an energy storage system. Background Technology

[0002] Wind turbines utilize wind energy by converting it into electricity. When combined with energy storage battery technology, excess energy can be stored during periods of high or stable wind speeds and released during periods of low or no wind, thus creating a stable and reliable off-grid integrated wind-solar-storage system. Energy storage batteries, with their high energy conversion efficiency, rapid response characteristics, and excellent cycle performance, complement wind power generation, significantly improving the autonomy and continuity of power supply systems in residential or remote areas.

[0003] Among wind turbine types, vertical axis wind turbines, with their shafts perpendicular to the ground, can capture wind from any direction without yaw. They are compact, operate smoothly, and are easy to maintain, making them particularly suitable for residential applications with limited space and variable wind directions. Hybrid lift-drag vertical axis wind turbines combine the advantages of lift and drag blades: the lift section provides high speed and high efficiency, while the drag section offers excellent starting performance and low-wind-speed adaptability.

[0004] Existing drag blades are typically formed by stretching a single plane vertically along the axial direction, resulting in a cross-sectional shape lacking aerodynamic optimization. This structure easily leads to airflow symmetry or torque balance at certain angles, preventing the rotor from starting spontaneously—a significant "start-up dead zone" severely restricts the unit's self-starting capability and energy capture efficiency under low wind conditions. Therefore, a novel drag blade configuration is urgently needed to effectively eliminate the start-up dead zone while retaining the high starting torque advantage of drag-type wind turbines, thereby improving operational reliability and wind energy utilization under low wind speed conditions. Summary of the Invention

[0005] This application provides a wind turbine generator and an energy storage system that overcomes or at least partially solves the above-mentioned problems.

[0006] According to one aspect of the embodiments of this application, a wind turbine is provided, including a generator, a shaft, and a drag rotor; the shaft is the input end of the generator; the drag rotor includes two drag blades and a chassis and a top cover spaced apart, the drag blades are respectively fixed to the chassis and the top cover, and the chassis is fixed to the shaft; the drag rotor is configured to rotate along a first rotation direction; with the center of the chassis as the center, one of the drag blades can rotate 180 degrees along a second rotation direction to coincide with the other drag blade, the second rotation direction being opposite to the first rotation direction; the drag blade has a middle cross section, a top surface connected to the top cover, and a bottom surface connected to the chassis; along the second rotation direction, the top surface is twisted relative to the middle cross section by a first preset angle, and the bottom surface is twisted relative to the middle cross section by a second preset angle.

[0007] In one alternative approach, the first preset angle is less than 60 degrees, and / or the second preset angle is less than 60 degrees.

[0008] In one alternative approach, the first preset angle is less than 45 degrees, and / or the second preset angle is less than 45 degrees.

[0009] In one alternative embodiment, the distance from the intermediate cross-section to the top surface or the bottom surface along the axial direction of the rotation axis is always... The distance between the opposing ends of the two resistance blades is D; / D>33 / 84.

[0010] In one alternative embodiment, the chassis extends toward the generator with a mounting portion that is detachably fixed to the shaft.

[0011] In one alternative embodiment, the drag blade bends and extends to form a first assembly portion detachably fixed to the top cover, the top surface being located in the first assembly portion; the drag blade bends and extends to form a second assembly portion detachably fixed to the chassis, the bottom surface being located in the second assembly portion.

[0012] In one alternative approach, vector coordinates are used. ,in The axial directions of the shaft and the rotating shaft coincide, and the direction from the bottom surface to the top surface is... The positive direction of the axis, where The shaft is parallel to the chassis, and points from the center of the chassis to the edge of the chassis. The positive direction of the axis, where The shaft is parallel to the chassis, and points from the center of the chassis to the edge of the chassis. The positive direction of the axis, axis, shaft and The axes are perpendicular to each other; The intermediate cross-section is represented as follows: ; The top surface is represented as follows: ; The bottom surface is represented as follows: ; Wherein, the first preset angle is the same as the second preset angle, and both the first preset angle and the second preset angle are used. It is indicated that, along the axial direction of the rotating shaft, the distance from the intermediate cross-section to the top surface or the bottom surface is represented by... express.

[0013] In one alternative, the positive force surface of the drag blade is configured to face the first rotation direction so that the drag rotor can rotate in the first rotation direction.

[0014] In one alternative embodiment, the cross-section of the drag blade has a connected straight section and a curved section, the straight section being disposed near the center of the chassis and the curved section being disposed near the edge of the chassis, the concave surface of the curved section forming the positive force surface and the convex surface of the curved section forming the negative force surface.

[0015] According to another aspect of the embodiments of this application, an energy storage system is provided, including an energy storage battery and the wind turbine, wherein the energy storage battery is connected to the wind turbine.

[0016] The beneficial effects of this application embodiment are as follows: This application embodiment provides a wind turbine generator, including a generator, a shaft, and a drag rotor; the shaft is the input end of the generator; the drag rotor includes two drag blades and a chassis and a top cover spaced apart, the drag blades are respectively fixed to the chassis and the top cover, and the chassis is fixed to the shaft; the drag rotor is configured to rotate along a first rotation direction; with the center of the chassis as the center, one of the drag blades can coincide with the other drag blade after rotating 180 degrees along a second rotation direction, the second rotation direction being opposite to the first rotation direction; the drag blade has a middle cross section, a top surface connected to the top cover, and a bottom surface connected to the chassis; along the second rotation direction, the top surface is twisted relative to the middle cross section by a first preset angle, and the bottom surface is twisted relative to the middle cross section by a second preset angle. With this wind turbine generator, both the top and bottom surfaces are twisted along the first rotation direction, thereby expanding the range of force angles, reducing the risk of starting dead zones, and even overcoming the defects of starting dead zones. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a drag-type wind turbine in the prior art; Figure 2 This is a schematic diagram of the cross-section of a drag blade in the prior art; Figure 3 This is a schematic diagram of a wind turbine provided in an embodiment of this application; Figure 4 This is an exploded schematic diagram of a wind turbine provided in an embodiment of this application; Figure 5 This is a schematic diagram of the drag blade provided in an embodiment of this application; Figure 6 This is a schematic diagram of the cross-section of the drag blade provided in an embodiment of this application; Figure 7 This is a trace diagram of a wind turbine provided in an embodiment of this application; Figure 8 This is a model diagram of the wind turbine provided in the embodiments of this application; Figure 9 This is a schematic diagram of the surface construction principle provided in the embodiments of this application; Figure 10 This is a schematic diagram of the energy storage system provided in the embodiments of this application.

[0019] The attached figures are labeled as follows: 100p, wind turbine; Dp, axial direction of the shaft; 1p, Generator; 2p, Shaft; 3p, Resistance Rotor; 31p, drag blade; 311p, cross section; 312p, positive force surface; 313p, negative force surface; 100. Wind turbine generator; D1. Axial direction of the shaft; C1. First direction of rotation; C2. Second direction of rotation; 1. Generator; 2. Shaft; 3. Resistance rotor; 4. Fasteners; 31. Drag blades; 32. Chassis; 33. Top cover; 31a. Intermediate cross-section; 31b. Top surface; 31c. Bottom surface; 31m, positive force surface; 31n, negative force surface; 311n, concave region; 32a. Installation Department; 311. First Assembly Section; 312. Second Assembly Section; 311a, straight section; 312a, curved section; 200. Energy storage system; 2001, Energy storage battery; 2002, Controller; 2003, AC-DC rectifier; 2004, Filter; 2005, Step-up / step-down converter; K1, First relay; K2, Second relay; 2006, Display panel; 2007, Inverter; 2008, AC load; 2009, DC load. Detailed Implementation

[0020] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0022] To facilitate the reader's understanding of the design concept of this application, the existing wind turbine 100p is explained below, such as... Figure 1 and Figure 2 As shown, the wind turbine 100p in the prior art includes a generator 1p, a shaft 2p and a drag rotor 3p, wherein the drag rotor 3p includes two drag blades 31p.

[0023] The drag blade 31p has a cross section 311p, which is a plane obtained by cutting the drag blade 31p with a section perpendicular to the axial direction Dp of the rotation axis 2p. The cross section 311p is stretched along the axial direction Dp of the rotation axis 2p to obtain the drag blade 31p. A portion of the cross section 311p is curved, so that the drag blade 31p forms a concave surface on the windward side and a convex surface on the leeward side, resulting in a positive force surface 312p on the windward side and a negative force surface 313p on the leeward side, thereby utilizing the wind pressure difference to drive the drag blade 31p to rotate.

[0024] The drag blade 31p has a longitudinal section, which is a plane obtained by cutting the drag blade 31p using a section that coincides with the axial direction Dp of the rotating shaft 2p. The longitudinal section of the drag blade 31p is straight, and there is no difference in drag coefficient on the longitudinal section, which leads to a start-up dead zone in some cases, preventing the drag rotor 3p from rotating and affecting the operation of the wind turbine 100p.

[0025] Please see Figures 3 to 5 This application provides a wind turbine generator 100, which includes a generator 1, a shaft 2, and a drag rotor 3. The shaft 2 is the input end of the generator 1. The drag rotor 3 includes two drag blades 31 and a base 32 and a top cover 33 spaced apart, wherein the base 32 and the top cover 33 may be spaced apart along the axial direction D1 of the shaft 2. The drag blades 31 are respectively fixed to the base 32 and the top cover 33, and the base 32 is fixed to the shaft 2, wherein the center of the base 32 may coincide with the axis of the shaft 2. The resistance impeller 3 is configured to rotate along a first rotation direction C1. With the center of the chassis 32 as the center, one of the resistance blades 31 can rotate 180 degrees along a second rotation direction C2 to coincide with another resistance blade 31. The second rotation direction C2 is opposite to the first rotation direction C1. The resistance blade 31 has a middle cross-section 31a, which is a plane obtained by cutting the resistance blade 31 through a section perpendicular to the axial direction D1 of the rotating shaft 2 and along the axial direction D1 of the rotating shaft 2, passing through the center of the resistance blade 31. The resistance blade 31 also has a top surface 31b connected to the upper cover 33 and a bottom surface 31c connected to the chassis 32. Along the second rotation direction C2, the top surface 31b is twisted relative to the middle cross-section 31a by a first preset angle, and the bottom surface 31c is twisted relative to the middle cross-section 31a by a second preset angle, forming a twisted state of the resistance blade 31. The first preset angle and the second preset angle may be equal or unequal, and the specific setting is adaptively determined according to the wind field environment and the required start-up wind speed. This application embodiment uses the example of the first preset angle and the second preset angle being equal for illustration. Figure 5 shown That is, the first rotation angle or the second rotation angle. Figure 5 The middle cross-section 31a is shown with a dashed line, while the top surface 31b or bottom surface 31c is shown with a solid line. Figure 5 The first rotation angle is shown as an example. Or the second rotation angle .

[0026] Furthermore, the drag blade 31 has a longitudinal section, which is a plane obtained by cutting the drag blade 31 using a section that coincides with the axial direction D1 of the rotating shaft 2. The top surface 31b is twisted relative to the intermediate cross-section 31a, and the bottom surface 31c is twisted relative to the intermediate cross-section 31a. The longitudinal section of the drag blade 31 is no longer straight, but curved, so that the windward angle of the drag blade 31 at different positions along the axial direction D1 of the rotating shaft 2 forms a gradient distribution. The range of the force angle of the drag blade 31 is expanded. For example, when the force angle of the drag blade 31 in the prior art is 90 degrees, the range of the force angle of the drag blade 31 in this embodiment can be extended to multiple angles greater than 90 degrees, thereby easily forming a force difference in the wind field, reducing the risk of generating a start-up dead zone, and even overcoming the start-up dead zone, thus improving the start-up performance of the wind turbine 100.

[0027] In some implementations, the positive force surface 31m of the drag blade 31 is configured to face the first rotation direction C1, so that the drag impeller 3 can rotate along the first rotation direction C1. When wind acts on the drag blade 31, the positive force surface 31m bears the main wind pressure, driving the drag impeller 3 to rotate along the first rotation direction C1.

[0028] In some implementations, such as Figure 6 As shown, and in combination Figure 1 The drag blade 31 has a cross-section with a connected straight section 311a and a curved section 312a. The cross-section of the drag blade 31 is a plane obtained by cutting the drag blade 31 with a section perpendicular to the axial direction D1 of the rotating shaft 2. The cross-section of the drag blade 31 includes the aforementioned intermediate cross-section 31a. Figure 6 The straight section 311a and the curved section 312a are shown using a mid-section 31a. The straight section 311a is located near the center of the chassis 32, and the straight sections 311a of the two drag blades 31 have overlapping areas. The curved section 312a is located near the edge of the chassis 32, with the concave surface of the curved section 312a forming the positive force surface 31m and the convex surface of the curved section 312a forming the negative force surface 31n.

[0029] In some implementations, the chord length of the drag blade 31 is d, that is, the distance between the end of the straight section 311a away from the curved section 312a and the end of the curved section 312a away from the straight section 311a is d, the extension length of the straight section 311a is 0.42d, the length of the overlapping area of ​​the straight sections 311a of the two drag blades 31 is 0.4d, and the spacing between the straight sections 311a of the two drag blades 31 is 0.1d; the arc of the curved section 312a is 135°, and the radius of curvature of the curved section 312a is 0.42d.

[0030] In addition, such as Figure 7 As shown, Figure 7 This is a trace diagram of the wind turbine generator 100 provided in the embodiments of this application. Figure 7 In this context, "pathines" refers to the flow path, "velocity" to the velocity, "Velocity Magnitude" to the velocity value, and "m / s" to the velocity unit. A pathine represents the path traversed by a single fluid particle over a period of time. Figure 7 The trajectory of the trail illustrates the process of airflow passing through the drag blade 31; the intensity of the trail's color indicates the magnitude of the airflow velocity. Figure 7 As shown, the curved surface constructed after the drag blade 31 is twisted can enhance the interception of airflow by the positive force surface 31m and weaken the impact of airflow on the negative force surface 31n, thereby effectively improving the utilization efficiency of wind energy by the drag blade 31.

[0031] In the process of developing this application, the applicant discovered that when the first preset angle is ≥60 degrees or the second preset angle is ≥60 degrees, a recessed area 311n is easily formed at the end of the resistance blade 31 near the chassis 32 or the top cover 33 (e.g. Figure 8 As shown), that is, at the end of the drag blade 31 near the chassis 32 or the top cover 33, the convex surface (negative force surface 31n) is prone to depression, forming a recessed area 311n (as shown). Figure 8 As shown, the recessed area 311n weakens the original effect of the negative force surface 31n, increases the impact of airflow on the negative force surface 31n, thereby weakening the work-capacity of the drag blade 31 and reducing the wind energy conversion efficiency. In some embodiments, the first preset angle is limited to <60 degrees, and / or the second preset angle is limited to <60 degrees. By limiting this, the risk of generating the aforementioned recessed area 311n is reduced, thereby effectively weakening the impact of airflow on the negative force surface 31n, ensuring the work-capacity of the drag blade 31, and ensuring the wind energy conversion efficiency.

[0032] It is worth noting that in some embodiments, the first preset angle is less than 45 degrees, and / or the second preset angle is less than 45 degrees. This limitation avoids the formation of the aforementioned recessed area 311n, further optimizes the impact of airflow on the negative force surface 31n, further ensures the work-capacity of the drag blades 31, and ensures the efficiency of wind energy conversion.

[0033] In other words, in this embodiment, by twisting the top surface 31b relative to the intermediate cross-section 31a by a first preset angle along the second rotation direction C2, and twisting the bottom surface 31c relative to the intermediate cross-section 31a by a second preset angle, the drag blade 31 is twisted, thus reducing the risk of a dead zone during startup. At the same time, by further limiting the first and second preset angles, the formation of the recessed area 311n is effectively suppressed, reducing the risk of structural defects caused by large twists in the drag blade 31. Thus, while ensuring the startup performance of the drag blade 31, the conversion efficiency of the wind turbine 100 to wind energy is also ensured.

[0034] Please refer to Figure 1 and combination Figure 5 Along the axial direction D1 of the rotating shaft 2, the distance from the intermediate cross-section 31a to the top surface 31b or the bottom surface 31c is 1 / 2. The distance between the opposing ends of the two resistance blades 31 is D. In the process of implementing this application, the applicant discovered that when... When D is relatively small, the aforementioned concave region 311n is easily formed, affecting the effect of the negative force surface 31n, thereby weakening the work-capacity of the drag blade 31 and reducing the wind energy conversion efficiency. Therefore, in some embodiments, the limitation is... / D>33 / 84, through this limitation, the risk of generating a depression area 311n is reduced, ensuring that the negative force surface 31n is subjected to a smaller impact, ensuring the work capacity of the drag blade 31, and ensuring the conversion efficiency of wind energy.

[0035] It is worth noting that in some embodiments, please refer to [link / reference]. Figure 2 The chassis 32 extends a mounting portion 32a toward the generator 1, and the mounting portion 32a is detachably fixed to the rotating shaft 2. The mounting portion 32a may be detachably fixed to the rotating shaft 2 by a fastener 4, which may be a fastening element such as a screw, bolt, or rivet.

[0036] In some embodiments, please refer to Figure 2 The drag blade 31 is bent and extended to form a first assembly portion 311 that is detachably fixed to the upper cover 33, and the top surface 31b is located in the first assembly portion 311. The drag blade 31 is bent and extended to form a second assembly portion 312 that is detachably fixed to the chassis 32, and the bottom surface 31c is located in the second assembly portion 312. The first assembly portion 311 can be detachably fixed to the upper cover 33 by fasteners 4, and the second assembly plate can be detachably fixed to the chassis 32 by fasteners 4. The fasteners 4 can be fastening elements such as screws, bolts, or rivets.

[0037] It is worth noting that in some embodiments, such as Figure 9 As shown, using vector coordinates ,in The axis D1 of the shaft coincides with that of the rotating shaft 2, and the direction from the bottom surface 31c to the top surface 31b is... The positive direction of the axis, where The shaft is parallel to the chassis 32, and extends from the center of the chassis 32 to its edge. The positive direction of the axis, where The shaft is parallel to the chassis 32, and extends from the center of the chassis 32 to its edge. The positive direction of the axis, axis, shaft and The axes are perpendicular to each other.

[0038] The intermediate cross section 31a is represented by the following formula 1. ; The top surface 31b is represented by the following formula 2. , formula 2; The bottom surface 31c is represented by the following formula 3. , formula 3; Wherein, the first preset angle is the same as the second preset angle, and both the first preset angle and the second preset angle are used. It is indicated that, along the axial direction D1 of the rotating shaft 2, the distance from the intermediate cross-section 31a to the top surface 31b or the bottom surface 31c is represented by... express.

[0039] In this context, Formula 1 represents the mathematical expression for the intermediate cross-section 31a in a three-dimensional coordinate system. The top surface 31b or the bottom surface 31c is obtained by rotating and translating the intermediate cross-section 31a, and is represented by Formulas 2 and 3, respectively. Formulas 1, 2, and 3 clearly show the geometric relationship between the intermediate cross-section 31a, the top surface 31b, and the bottom surface 31c.

[0040] This application also provides an embodiment of an energy storage system 200, please refer to [link to embodiment]. Figure 10 The energy storage system 200 includes an energy storage battery 2001 and a wind turbine generator 100, with the energy storage battery 2001 connected to the wind turbine generator 100.

[0041] In some embodiments, the energy storage system 200 further includes a controller 2002, an AC-DC rectifier 2003, a filter 2004, a step-up / step-down transformer 2005, a first relay K1, a second relay K2, a display panel 2006, and an inverter 2007. The wind turbine 100 is connected to the AC-DC rectifier 2003, the filter 2004 is connected to the step-up / step-down transformer 2005, the step-up / step-down transformer 2005 is connected to the controller 2002, the step-up / step-down transformer 2005 is connected to the first relay K1, the first relay K1 is connected to the controller 2002, the first relay K1 is connected to the energy storage battery 2001, the energy storage battery 2001 is connected to the second relay K2, the second relay K2 is connected to the controller 2002, and the second relay K2 is connected to the inverter 2007. The inverter 2007 supplies power to the AC load 10 and the DC load 11. The display panel 2006 is connected to the controller 2002 and can display the output status of the energy storage system 200. For the specific structure and function of the wind turbine generator 100, please refer to the above embodiments; they will not be repeated here.

[0042] In this embodiment, the wind turbine 100 generates alternating current, which is sent to the step-up / step-down transformer 2005 via the AC-DC rectifier 2003 and the filter 2004. The step-up / step-down transformer 2005 receives a control signal from the controller 2002 and matches the voltage to charge the energy storage battery 2001 via the first relay K1. When fully charged, the first relay K1 disconnects. The energy in the energy storage battery 2001 is sent to the inverter 2007 via one path (the second relay K2) to power the AC load 10 and the DC load 11. When the energy storage battery 2001 is undervoltage, the second relay K2 disconnects. The controller 2002 can control the display panel 2006 to display the output status.

[0043] It is worth noting that in some embodiments, the above-mentioned display panel 2006 may not be provided, and the functions of the energy storage system 200 provided in this application embodiment can still be achieved.

[0044] It should be noted that while preferred embodiments of this application are provided in the specification and accompanying drawings, this application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this application; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this application. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A wind turbine generator, characterized in that, include: Generator, shaft, and drag rotor; The rotating shaft is the input end of the generator; The drag impeller includes two drag blades and a chassis and a top cover spaced apart. The drag blades are fixed to the chassis and the top cover, respectively, and the chassis is fixed to the rotating shaft. The drag impeller is configured to rotate along a first rotation direction. With the center of the chassis as the center, one of the drag blades can be rotated 180 degrees along the second rotation direction to coincide with the other drag blade, and the second rotation direction is opposite to the first rotation direction; The drag blade has a central cross-section, a top surface connected to the upper cover, and a bottom surface connected to the chassis; Along the second rotation direction, the top surface is twisted by a first preset angle relative to the intermediate cross-section, and the bottom surface is twisted by a second preset angle relative to the intermediate cross-section.

2. The wind turbine generator according to claim 1, characterized in that, The first preset angle is less than 60 degrees, and / or the second preset angle is less than 60 degrees.

3. The wind turbine generator according to claim 1, characterized in that, The first preset angle is less than 45 degrees, and / or the second preset angle is less than 45 degrees.

4. The wind turbine generator according to any one of claims 1-3, characterized in that, Along the axial direction of the rotating shaft, the distance from the intermediate cross-section to the top surface or the bottom surface is always... The distance between the opposing ends of the two resistance blades is D; / D>33 / 84.

5. The wind turbine generator according to any one of claims 1-3, characterized in that, The chassis extends toward the generator and has a mounting portion that is detachably fixed to the rotating shaft.

6. The wind turbine generator according to any one of claims 1-3, characterized in that, The resistance blade bends and extends to form a first assembly portion that is detachably fixed to the upper cover, and the top surface is located in the first assembly portion; the resistance blade bends and extends to form a second assembly portion that is detachably fixed to the chassis, and the bottom surface is located in the second assembly portion.

7. The wind turbine generator according to any one of claims 1-3, characterized in that, Using vector coordinates ,in The axial directions of the shaft and the rotating shaft coincide, and the direction from the bottom surface to the top surface is... The positive direction of the axis, where The shaft is parallel to the chassis, and points from the center of the chassis to the edge of the chassis. The positive direction of the axis, where The shaft is parallel to the chassis, and points from the center of the chassis to the edge of the chassis. The positive direction of the axis, axis, shaft and The axes are perpendicular to each other; The intermediate cross-section is represented as follows: ； The top surface is represented as follows: ； The bottom surface is represented as follows: ； Wherein, the first preset angle is the same as the second preset angle, and both the first preset angle and the second preset angle are used. It is indicated that, along the axial direction of the rotating shaft, the distance from the intermediate cross-section to the top surface or the bottom surface is represented by... express.

8. The wind turbine generator according to any one of claims 1-3, characterized in that, The positive force surface of the drag blade is configured to face the first rotation direction so that the drag impeller can rotate along the first rotation direction.

9. The wind turbine generator according to claim 8, characterized in that, The drag blade has a cross-section with a straight section and a curved section connected together. The straight section is located near the center of the chassis, and the curved section is located near the edge of the chassis. The concave surface of the curved section forms the positive force surface, and the convex surface of the curved section forms the negative force surface.

10. An energy storage system, characterized in that, It includes an energy storage battery and a wind turbine as described in any one of claims 1-9, wherein the energy storage battery is connected to the wind turbine.

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