Breeze generator wind wheel blade with wind direction diversion steps and wind wheel
By setting up a wind direction guide step on the outer arc surface of the wind wheel blade, the problem of zero torque problem and insufficient reinforcement ribs during wind power driving of the wind wheel blade is solved, the rotation torque and mechanical strength of the wind wheel are improved, and noise and resistance are reduced.
Patent Information
- Application Number
- CN202422127723.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-08-30
AI Technical Summary
Existing wind wheel blades are prone to zero torque problems when driven by wind, which causes the wind wheel to fail to start rotation; at the same time, the strength of the reinforcement ribs of the blades is insufficient or too far apart, which may cause resonance and increase noise and resistance.
An arc-shaped wind-direction guide step is set up on the outer arc surface of the petal-shaped vertical axis wind wheel blade. The starting point is located at the upper edge of the top of the blade, the end point is located at the lower edge of the bottom end of the blade, and the step faces the outer edge of the blade. The steps are divided into upper transition section, intermediate section and lower transition section. The intermediate section is linear and is smoothly connected to the starting point and end point through the transition section.
By increasing the rotational torque of the wind wheel blades, the problem of zero torque is eliminated, the smoothness of the transition between the two adjacent blades is improved, and the working stability of the wind wheel is increased. At the same time, the added wind direction guide steps cooperate with the reinforcement ribs in the arc surface of the blade, which improves the mechanical strength of the blades and reduces rotation resistance and noise.
Smart Images
Figure CN222976949U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a wind turbine rotor of a wind power generator, in particular to a blade of a vertical-axis micro-wind power generator, and specifically to a blade and a rotor of a micro-wind power generator with a wind direction guiding step. Background Art
[0002] As is well known, the wind turbine rotor is one of the important components in a wind power generation system. The wind turbine rotor shoulders the important task of converting wind energy into mechanical energy. The structure, quality and working state of the wind blades on the wind turbine rotor have a great influence on the working effect of the wind power generation system.
[0003] For a petal-shaped vertical-axis micro-wind power generator wind turbine rotor with the wind blades perpendicular to the ground, the blades are components for receiving wind power drive, usually not less than two, and the blades are petal-shaped. The outer arc surface is the leeward surface. The blades are fixed on the vertical axis. The upper and lower ends of the vertical axis are respectively fixedly connected with the upper and lower fairings to form a wind turbine rotor. The lower fairing is used to fix the vertical axis and the blades on the base of the wind power generation set, as Figure 1 shown.
[0004] The air flow usually flows parallel to the tangent direction of the outer arc surface of the blade. Therefore, for the consideration of reducing frictional resistance, the outer arc surface of the blade is usually designed as a smooth curved surface. Although the smooth curved surface takes care of reducing resistance, two factors are not considered:
[0005] One is that the zero moment problem when the side of the blade faces the wind direction is not considered. For even-numbered blades, the probability of this situation is relatively high, which is likely to cause the wind turbine rotor to fail to start rotating;
[0006] The other is that ordinary blades usually only set blade stiffeners in the plane direction perpendicular to the rotation axis. However, blade wind vibration may propagate in multiple directions. If the strength of the stiffeners themselves is insufficient or the distance between adjacent stiffeners is too large, resonance may be formed in the rotation axis direction, increasing the noise and resistance generated during the operation of the wind turbine rotor. Content of the Utility Model
[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a blade and a rotor of a micro-wind power generator with a wind direction guiding step. This petal-shaped vertical-axis micro-wind power generator wind turbine blade can increase the driving torque of the wind turbine rotor, improve the smoothness during the transition between two adjacent blades, and increase the working stability of the wind turbine rotor; increase the mechanical strength of the blade, improve the wind resistance ability, reduce the rotation resistance and lower the blade operation noise.
[0008] The technical solution for achieving the purpose of the utility model is as follows:
[0009] A wind turbine blade for a micro wind generator with a wind direction guiding step, including petal-shaped vertical axis blades. Different from the prior art, an arc-shaped wind direction guiding step is provided on the outer arc surface of the blade. The starting point of the wind direction guiding step is located at the upper edge of the blade tip, and the ending point of the wind direction guiding step is located at the lower edge of the blade bottom; the wind direction guiding step faces the outer edge direction of the blade.
[0010] Further, the wind direction guiding step is divided into three parts: an upper transition section, a middle section, and a lower transition section. After the blade is unfolded from the arc surface into a plane, the middle section is linear; the upper end of the middle section is smoothly connected to the starting point through the upper transition section, and the lower end of the middle section is smoothly connected to the ending point through the lower transition section.
[0011] Further, the length of the middle section is 80%-90% of the total length of the wind direction guiding step, and the sum of the lengths of the upper transition section and the lower transition section is 10%-20% of the total length of the wind direction guiding step.
[0012] Further, the height of the wind direction guiding step is 0.5%-5.0% of the maximum rotation radius of the blade.
[0013] Another object of the present invention is to provide a wind turbine for a micro wind generator with a wind direction guiding step. The technical solution is as follows:
[0014] A wind turbine for a micro wind generator with a wind direction guiding step, including a vertical axis, an upper fairing, and a lower fairing. Different from the prior art, it includes the wind turbine blade for a micro wind generator with the above-mentioned wind direction guiding step. The number of blades is at least two, and each blade is evenly distributed along the circumference of the vertical axis and fixed on the vertical axis. The upper end of the blade and the upper end of the vertical axis are fixedly connected to the upper fairing, and the lower end of the blade and the lower end of the vertical axis are fixedly connected to the lower fairing.
[0015] Preferably, the number of the blades is two, and the two blades are evenly distributed along the circumference of the vertical axis and fixed on the vertical axis.
[0016] Preferably, the number of the blades is three, and the three blades are evenly distributed along the circumference of the vertical axis and fixed on the vertical axis.
[0017] The above-mentioned wind turbine blade for a micro wind generator with a wind direction guiding step is applied to the wind turbine of a wind power generator.
[0018] The above-mentioned wind turbine blade for a micro wind generator with a wind direction guiding step is applied to a wind power generator.
[0019] The above-mentioned wind turbine for a micro wind generator with a wind direction guiding step is applied to a wind power generator.
[0020] Advantages of the present invention:
[0021] The utility model increases the rotational torque of the wind turbine blades by arranging a wind direction diversion step on the petals-shaped vertical axis wind turbine blades, eliminates the zero torque problem that may occur when the blades face the incoming wind direction sideways, improves the smoothness during the transition between two adjacent blades, and increases the working stability of the wind turbine; the additionally arranged wind direction diversion step, in cooperation with the reinforcing ribs on the inner arc surface of the blade, increases the mechanical strength of the blade, improves the wind resistance, reduces the rotational resistance, and lowers the blade noise. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 FIG. is a schematic structural diagram of the wind turbine and blades of an existing petals-shaped vertical axis micro wind generator;
[0023] Figure 2 Figure 3 FIG. is a schematic structural diagram of the wind turbine blade of a micro wind generator with a wind direction diversion step in the embodiment;
[0024] Figure 4 FIG. is a schematic structural diagram of the blade in the embodiment when it is unfolded from the arc surface into a plane;
[0025] Figure 5 Figure 6 FIG. is a schematic structural diagram of two wind turbine blades of a micro wind generator with a wind direction diversion step in the embodiment;
[0026] Figure 7 FIG. is a bottom view structural diagram of two wind turbine blades of a micro wind generator with a wind direction diversion step in the embodiment;
[0027] Figure 8 FIG. is a schematic structural diagram of three wind turbine blades of a micro wind generator with a wind direction diversion step in the embodiment;
[0028] Figure 9 FIG. is a bottom view structural diagram of three wind turbine blades of a micro wind generator with a wind direction diversion step in the embodiment.
[0029] In the figures, 1. blade; 2. outer arc surface; 3. wind direction diversion step; 4. vertical axis; 5. upper fairing; 6. lower fairing; 7. reinforcing rib; 8. outer edge; 1-1. upper edge; 1-2. lower edge; 3-1. starting point; 3-2. ending point; 3-3. upper transition section; 3-4. middle section; 3-5. lower transition section. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.
[0032] As Figure 1 shown, Figure 1 FIG. is a schematic structural view of a wind wheel and blades of an existing petal-shaped vertical-axis micro-wind generator. For the petal-shaped vertical-axis wind wheel, its blade 1 is fixed on the vertical axis 4, and the blade 1 is a component for receiving wind power drive; the blade 1 is petal-shaped, its outer arc surface 2 is the windward side, and multiple reinforcing ribs 7 are provided on the inner arc surface; the upper and lower ends of the vertical axis 4 are respectively fixedly connected to the upper fairing 5 and the lower fairing 6 to form a wind wheel, and the lower fairing 6 is used to fix the vertical axis 4 and the blade 1 on the base of the wind power generating set.
[0033] Embodiment 1:
[0034] As Figures 2 - 9 shown, a micro-wind generator wind wheel blade with a wind direction guiding step includes a petal-shaped vertical-axis blade. An arc-shaped wind direction guiding step 3 is provided on the outer arc surface 2 of the blade 1. The starting point 3-1 of the wind direction guiding step 3 is located at the upper edge 1-1 of the top end of the blade 1, and the ending point 3-2 of the wind direction guiding step 3 is located at the lower edge 1-2 of the bottom end of the blade 1; the wind direction guiding step 3 faces the outer edge 8 direction of the blade 1.
[0035] The wind direction guiding step 3 is divided into three parts: an upper transition section 3-3, a middle section 3-4, and a lower transition section 3-5. After the blade 1 is unfolded from the arc surface into a plane, the middle section 3-4 is linear; the upper end of the middle section 3-4 is smoothly connected to the starting point 3-1 through the upper transition section 3-3, and the lower end of the middle section 3-4 is smoothly connected to the ending point 3-2 through the lower transition section 3-5, as Figure 4 shown.
[0036] In this example, the starting point 3-1 of the wind direction guiding step 3 is located at the intersection of the upper edge 1-1 of the top end of the blade 1 and the outer edge 8, and the ending point 3-2 is located at the middle of the lower edge 1-2, as Figure 2 Figure 3 shown.
[0037] The length of the middle section 3-4 is 80%-90% of the total length of the wind direction guiding step 3, and the sum of the lengths of the upper transition section 3-3 and the lower transition section 3-5 is 10%-20% of the total length of the wind direction guiding step 3. In this example, the total length of the wind direction guiding step 3 is 850 mm, the length of the middle section 3-4 is 700 mm, the length of the upper transition section 3-3 is 100 mm, and the length of the lower transition section 3-5 is 50 mm.
[0038] The height of the wind direction guiding step 3 is 0.5%-5.0% of the maximum rotation radius of the blade 1. In this example, it is taken as 2.0%. The maximum rotation radius of the blade 1 is 275.0 mm, and the height of the wind direction guiding step 3 is 5.5 mm.
[0039] The above-mentioned wind turbine blade with a wind direction guiding step is applied to the wind turbine rotor and / or the wind turbine.
[0040] Embodiment 2:
[0041] As Figures 2 - 7 shown, a wind turbine rotor with a wind direction guiding step includes a vertical shaft 4, an upper fairing 5 and a lower fairing 6, and includes the wind turbine blade with a wind direction guiding step described in Embodiment 1. The blade 1 is at least two pieces, and each blade is evenly arranged on the vertical shaft 4 along the circumferential direction of the vertical shaft 4. The upper ends of the blade 1 and the vertical shaft 4 are fixedly connected to the upper fairing 5, and the lower ends of the blade 1 and the vertical shaft 4 are fixedly connected to the lower fairing 6.
[0042] In this example, the blade 1 is two pieces, and the two blades 1 are evenly arranged on the vertical shaft 4 along the circumferential direction of the vertical shaft 4.
[0043] The above-mentioned wind turbine rotor with a wind direction guiding step is applied to a wind turbine.
[0044] Embodiment 3:
[0045] As Figure 8 Figure 9 shown, a wind turbine rotor with a wind direction guiding step. In this example, the blade 1 is three pieces, and the three blades 1 are evenly arranged on the vertical shaft 4 along the circumferential direction of the vertical shaft 4, and the rest is the same as Embodiment 2.
[0046] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The protection scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A micro-wind generator wind wheel blade with wind guide steps, comprising a petal-shaped vertical axis blade, characterized in that: An arc-shaped wind guide step (3) is provided on the outer arc surface (2) of the blade (1); the starting point (3-1) of the wind guide step (3) is located at the upper edge (1-1) of the top end of the blade (1), and the end point (3-2) of the wind guide step (3) is located at the lower edge (1-2) of the bottom end of the blade (1); the wind guide step (3) faces the outer edge (8) of the blade (1); The wind guide step (3) is divided into three parts: an upper transition section (3-3), a middle section (3-4) and a lower transition section (3-5); after the blade (1) is unfolded from an arc surface to a plane, the middle section (3-4) is in a straight line; the upper end of the middle section (3-4) is smoothly connected to the starting point (3-1) through the upper transition section (3-3), and the lower end of the middle section (3-4) is smoothly connected to the end point (3-2) through the lower transition section (3-5).
2. The micro-wind generator wind wheel blade with wind guide steps according to claim 1 is characterized in that: The height of the wind guide step (3) is 0.5%-5.0% of the maximum rotation radius of the blade (1).
3. The micro-wind generator wind wheel blade with wind guide steps according to claim 1, characterized in that: The length of the middle section (3-4) is 80%-90% of the total length of the wind guide step (3), and the sum of the lengths of the upper transition section (3-3) and the lower transition section (3-5) is 10%-20% of the total length of the wind guide step (3).
4. The micro-wind generator wind wheel blade with wind guide steps according to claim 1, characterized in that: The starting point (3-1) of the wind guide step (3) is located at the intersection of the upper edge (1-1) and the outer edge (8) at the top end of the blade (1), and the end point (3-2) is located in the middle of the lower edge (1-2).
5. A micro-wind generator wind wheel with wind guide steps, comprising a vertical shaft (4), an upper fairing (5) and a lower fairing (6), characterized in that: A micro-wind generator wind wheel blade with a wind guide step as claimed in any one of claims 1 to 4, wherein the number of the blades (1) is at least two, and each blade is evenly distributed on the vertical axis (4) along the circumference of the vertical axis (4), the upper end of the blade (1) and the upper end of the vertical axis (4) are fixedly connected to an upper fairing (5), and the lower end of the blade (1) and the lower end of the vertical axis (4) are fixedly connected to a lower fairing (6).
6. The micro-wind generator wind wheel with wind guide steps according to claim 5 is characterized in that: The blades (1) are two blades, and the two blades are evenly arranged on the vertical axis (4) along the circumferential direction of the vertical axis (4).
7. The micro-wind generator wind wheel with wind guide steps according to claim 5, characterized in that: The blades (1) are three in number, and the three blades are evenly distributed and arranged on the vertical axis (4) along the circumferential direction of the vertical axis (4).